Until now absolutely no Version upgrade starting with TinyERP than OpenERP and now ODOO had no breaking site changes and for sure this will be also the case with Odoo 10, which will be already outdated and upgraded by following versions until a majority of community modules will have moved to adapt and be securely working in Odoo 10.

Hi all:
I already listen (read) e-mails about preparing the new version (10) of
ODOO (Enterpreise and Community).
I think it would be a good think to review at least all the e-mail since
started ODOO V.9 (And great idea since ODOO V.8 started), to gather all
the problems that are expressed there to try to avoid in this new
version 10. And review how were OpenERP 7 and ODOO 8... their good
perfomance that were lost in ODOO 9, to try to replay in version 10.
I hope you will have an excellent ODOO 10.
--
Atentamente,
Jorge Rodríguez